Section R. 325.3621 - HeatingRule 21.
(1) A shelter and a common use room or area that is used before May 31 or after September 1 in any year shall be provided with properly installed, operable heating equipment that is capable of maintaining a temperature of not less than 65 degrees Fahrenheit.(2) Heating facilities that utilize combustible fuel when in a shelter shall be installed and vented in compliance with the manufacturer's instructions and shall be approved by the mechanical inspection authority that has jurisdiction or by a licensed mechanical contractor, except as provided in subrule (4) of this rule. A portable heater, other than an electric heater, is prohibited.(3) Heating facilities shall bear the seal of a recognized testing laboratory or the American gas association, except as provided in subrule (4) of this rule.(4) Facilities that are in existence on the effective date of these rules shall comply with all of the following provisions:(a) Heating facilities in a shelter that utilize combustible fuel shall be installed and vented to prevent fire hazards and a dangerous concentration of gases. A portable heater, other than an electric heater, is prohibited. If a solid or liquid fuel heater is situated on wood or other combustible flooring, a concrete slab, insulated metal sheet, or other fireproof material shall be provided on the floor under the heater.(b) A wall or ceiling that is within 18 inches of a solid or liquid fuel heater or a flue shall be made of fireproof material. A vented metal collar shall be installed around a flue that passes through a wall ceiling, floor, or roof.(c) A heating facility shall have automatic controls of the type that will cut off the fuel supply if the flame or ignition fails or is interrupted or if a predetermined safe temperature or pressure is exceeded.Mich. Admin. Code R. 325.3621